Lighting fixture



Dec. 8, 1942. H. K. PRAcHT LIGHTING FIXTURE Filed June 28, 1941' 2Sheets-Sheet 1 INVENTOR 'HeJZZf Klracht .47: y

Dec. 8, 1942. H. K. PRACHT- LIGHTING FIXTURE Filed June 28, 1941' 2SIge'e-t-Shget 2 INVENTOR HanryKPrachf Patented Dec. 8, 1942 I STATES 72,304,202

LIGHTING FIXTURE Henry K. Pracht, Irwin,

Pa., assignor to Pitts burgh Reflector Company, Pittsburgh, Pa., acorporation ofv New Jersey Application June 28, 1941, Serial No. 400,197

2 Claims.

In a preferred embodiment of the invention, it comprises The end capsare generally normal to the longitudinal axis of the fixture. Thereflectors are positioned on a curve and are substantially equidistantfrom the axis of the fixture. By this arrangement, the central planes ofthe reflectors are generally radial relative to the fixture axis so thatthe reflectors throw light downwardly and outwardly over a substantialarea.

If the fixture is suspended below the ceiling, as contrasted with aflush-type fixture, I utilize the supporting plate as a reflector andposition tubular light sources thereabove for illuminating the ceiling.

A complete understanding of the invention will result from aconsideration of the following detailed description thereof andreference to the accompanying drawings illustrating a preferredembodiment and a modification.

In the drawings:

Figure 1 is a view partly in side elevation and partly in longitudinalsection showing a fixture according to my invention adapted to besuspended below the ceiling;

Figure 2 is a transverse section taken substantially along the plane ofline IIII of Figure 1; and

Figure 3 is a view similar to Figure 2 showing a modification.

Referring now in detail to the drawings and, for the present, to Figures1 15 received in channel 20 sides [9.

25 End caps 2| fixture. Each end cap overlies the ends of all the V 30tially spaced straps (not shown).

45 tween the channel 10 and II. In the embodiment shown in Figures 1 and2, the supporting channel serves also as a 'reflector, as will bedescribed later. Its edges are bent upwardly as at l2 to provide agenerally 5 trough-shaped reflector. Beyond the portions I2,

the edges of the plate are bent downwardly to provide suspendingfianges'l3.

' A plurality of tro gh-shaped reflectors l4, four in the embodimentillustrated, are assembled 10 side-by-side and are supported on theinturned bottom edges l5 of the suspending flanges l3. The upper edgesof the outer reflectors 14 are secured to the inturned edges l5 byscrews-l6. The'adja'cent edges of the several'refiectors are strips I!which bind them tightly together. I

The particular reflectors M'illustrated have a flat bottom I8, planesloping lower sides It, and plane outer edges disposed at an angle tothethe edges 20 of adjacent reflectors are in contact flatwise, as shown inFigure 2, the axes of the reflectors lie substantially in a cylindricalsurface co-axial with the fixture as a whole.

are mounted at each end of the reflectors I4 and the supporting channelIn. Each end cap includes a disc 22 and a ring 23. The disc and ring areconnected by circumferen- The discs 22 are spaced inwardly of the rings23 and are secured by bolts 24 to supporting straps 25 depending fromthe ends of the channel l0. By this construction, light rays passingbetween the edge of the discs 22 and the ring 23, from light sources tobe described later, are reflected onto the exposed surfaces of the discs22, thereby illuminating them and enhancing the appearance of thefixture.

A lower supporting channel 26 is secured to the outer reflectors l4 andties all these reflectors into a rigid assembly. As shown, the flatbotthe plate 26 is free to accommodate control auxiliaries or the like,indicated at 21, for the light sources.

Lamp holders 28 are mounted in each of the reflectors I4 near each endthereof and luminous tubes 29 are inserted in the holders. Similarholders are secured to the supporting channel l0 and carry luminoustubes adapted to throw light from each tube to be directed generallyradially of the axis of the fixture whereby a uniform distribution oflight below and on each side of the fixture is obtained.

The fixture described above, which is illustrated in Figures 1 and 2, isadapted for mounting below the ceiling. A modified construction shown inFigure 3 is adapted for mounting flush against the ceiling. In this formof the invention, the reflectors M are assembled in the same relation asshown in Figures 1 and 2 but are suspended from a supporting channel 10which is substantially plane, having downturned flanges 13. The channelI is supported by any suitable hangers ll' dependingfrom'ceilingoutletboxes. The fixture shownin Figure 3 includes end caps 2|,generally similar to those shown at 2|, except that they are segmentalinstead of circular. In other respects, the fixture of Figure 3 issimilar to that shown in Figures 1 and 2.

It will be apparent that the invention is characterized by numerousadvantages. In the first place, the fixture is highly attractive inappearance. It is adapted to provide substantially uniformly distributedillumination downwardly and laterally and, in one form, is provided withmeans for illuminating the ceiling. The fixture may be constructed atrelatively low cost, utilizing standard parts to a large extent. Afurther advantage is that, when viewed from below, the fixture does notpresent any extensive areas which are dark, i. e., not illuminated bylight from the tubular sources, except the rings 23 of the end capswhich provide a pleasing contrast to the brightly illuminated remainderof the fixture. On the contrary, the fixture exhibits. a substantiallyuniformly bright appearance; as previously explained, even the ends ofthe fixture are illuminated, at least so far as the discs 2! thereof maybe seen.

Although I have illustrated anddescribed but a preferred embodiment anda modification of the invention, it will be understood that changes inthe arrangement or construction and parts may be made without departingfrom the spirit of the invention or the scope of the appended claims.

I claim:

1. An illuminating fixture comprising a channel, an assembly oftrough-shaped reflectors disposed on an arc about said channel andextending parallel thereto, said reflectors having plane bottoms ands'des which are plane over at least a portion of their width, theoutermost reflectors of said assembly having their bottoms in flatwiseengagement with the sides of said channel and secured thereto, the planeportions of the sides or all said reflectors being in flatwiseengagement with and secured to similar portions of the adjacentreflectors, a trough-shaped reflector above said assembly, meanslast-mentioned reflector and engaging the outermost reflectors of saidassembly for supporting it, and a luminous tube disposed in eachreflector.

2. An illuminating fixture comprising a channel, an assembly oftrough-shaped reflectors disposed on an are about said channel andextending parallel thereto; said reflectors having plane bottoms andsides which are plane over at least a portion of their width, theoutermost reflectors of said assembly having-their bottoms in flatwiseengagement with the sides of said channel and secured thereto, the planeportions of the sides of all said reflectors being in flat-wiseengagement with and secured to similar portions of the adjacentreflectors, a trough-shaped reflector "above said assembly, the edges ofsaid last-mentioned reflector being bent down to engage the edges ofsaid outermost reflectors and thereby support said assembly, and aluminou tube disposed in each of said reflectors.

HENRY K. PRACHT.

depending from said CERTIFICATE -OF CORRECTION;

Patent No. 2,50) .,202 December 8, 1914.2 7

HENRI K. PRACHT.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 1,first column, line strike out "pridinium, dimethyl-cyclohexyl-ammoniumsalts";

and that the said Letters Patent should be read with this correctiontherein that the same may conform to the record of the case in thePatent Office.

si ned-am sealed this "19th day of January, A. D. 19%.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

